Distributor for stokers



Sept. 24, 1946.-

' YATES 2,408,358'

DISTRIBUTOR FOR STOKERS Filed-May 7, 1945 '2 Sheets-Sheet l IN VEN TOR.

Patented Sept. 24 1946 UNITED" ST TES PATENT OFFICE H I V 2,4 7 I I i .1'

DISTRIBUTOR FOR STOKERS I Sheppard Boyd Yates, Hamlet, N. C.

Application May-7, 1945,'Serial No. 592,358

2 Claims. (c1.11o-105.5)

This invention relates to automatic stokers and to an improved jet assembly for distributing the coal to all parts of the fire box. f

An object of this invention is to provide an improved distributor for coal stokers whichis adapted to evenly distribute the coal about the 7 fire box and particularly the rear portion of the fire box so that the maximum heat may be obtainedvwithin the fire box. I o r Another object of this" invention is-to provide an improved distributor assembly including a 'coal guiding plate which isformed with aplurality of steam jets, and a second plate removably secured to the first plate and adapted to be positioned within the fire box, the second plate being formed with means for dissipating the heat a so that the second plate will be maintained relatively cool.

A further object of this invention is'to provide in a distributor construction of this kind an im--' proved coal guiding means whereby the inwardly moving coal may be guided overthedistributor plate in a manner to provide for the even distribution, of the coal in thefire box.

To the foregoing objects and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be morespecifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a fragmentary horizontal section of a fire box having a distributor mounted in the fire door opening thereof constructed according to an embodiment of this'invention,

Figure 2 is a fragmentary sectional view taken on the line 2-2 of Figure 1. v

Figure 3 is an inner end elevation of the distributor construction, 1

Figure 4 is an exploded plan view partly broken away and in section of the distributor assembly,

Figure 5 is a fragmentary sectional view taken on the line 5-5 of Figure 3, and

Figure 6 is a fragmentary sectional view taken on the line 6-6 of Figure 5.

Referring to the drawings, the numeral I designates generally the rear wall of a fire box II. The wall I!) is formed with a feed opening [3 through which the coalis adapted to be'discharged into the fire box or chamber 1 I. A screw conveyor [2, which is rotatably mounted in a housing [4, is adapted to feed the coal to the fire box, the conveyor l2 and associated parts being of a conventional construction and here shown as an illustration of a feeding means combined with the improved distributor assembly. The conveyor housing It is provided with an enlarged forward housing member l5 which is adapted to be secured about the opening 12.

A distributor plate "5 extends from the conveyor l2 andis secured in any suitable manner to the outer sideof'the wall In. The plate 16 is formed with a convex upper surface I! over which the coal is adapted topass. The plate I6 is also formed with a steam manifold I8 extending horizontally across the upper portion of the plate I6 at a point below the upper surface thereof and the manifold I8 is in communication with a pair of vertically disposed openings-or bores 19 extending downwardly and with which a pair of steam conducting pipes 20 are adapted to be connected. 1 j

The plate It is formed at its inner portion with a ledgeZl disposed below the upper surface of the plate and the ledge 2| forms at its rear portion a vertically disposed'shoulder 22. 'I he plate It is provided with a plurality of jet openings 23 communicating with the manifold I8 and opening inwardly toward the fire box H so that steam will beejectedin the same direction of the movement of the coal over the upper surface ll of the plate IS. The openings 23, as shown in Figure hare disposed on an angle to the line of travel of the coal over the plate I6 being of forwardly divergent relation to each other, so as to spread the coal out as the coal is being forced forwardly into the fire box H. A pair of sidewise directing nozzle members 24 are carried tion of the fire box adjacent the .wall it) will have 7 coal deposited therein.

A coal guiding plate 2'! is detachably secured to the plate l6 and is positioned within the fire box or chamber II. The plate 21 includes a pair of rearwardly extending supporting lugs 28 which are adapted to engage in a pair of sockets 29 formed in the plate Hi. The lugs 28 are detachably secured in the sockets 29 by means of pins 30 which are extended through the plate It and through openings 3| formed in the lugs 28. The securing members 39 are adapted to be flush with the guiding surface 2| formed at the forward portion of the plate I 6 The upper portion of the plate 21 is formed with a pair of recesses 32 within which the nozzle members 24 are adapted to engage and the plate 21' is also formed with ledges 33, which are slightly below the jet openings 25, so that the steam ejected through the openings 25 may be discharged over the ledge 23 and move some of the coal laterally of the line of travel of the main body of coal. The nozzles 2 as shown in Figure 5 communicate with the vertical steam passages I9. through horizontal passages 34. The plate 21 is provided with a plurality of vertically disposed and horizontally spaced apart slots 35, as shown more clearly in Figure 3, so as to provide a means for dissipating the heat communicated to the plate 2'! within the fire box.

In order toprovide a means whereby the coal passing over the plate I6 may be guided in its movement thereover, I have provided a pair of guiding plates 33 which, as shown in Figure 1, may be disposed in forwardly divergent relation. The, guiding plates 36 are carried by vertical shafts 31 extending through the housing extension I5 and having a lever or arm 38 secured to the upper end thereof. The arm 38 is adapted to swing over a toothed quadrant 39 supported by supporting means 40 from the housing eXtension I9. A spring-pressed lever locldng means 4| is carried by the lever 38 so that the guiding blades or plates 36 may be disposed in any selected angular relation with respect to each other or to the line of travel of the coal.

'In the use and operation of this device the coal is elevated by rotation of the elevating screw l2 and is forced forwardly through the housing extension I5 over the guiding plate It. As the coal passes over the upper surface ll of the guiding plate I6, this coal will come into contact with the forwardly ejected steam discharged from the jet openings 23. As the coal passes over the ledge 2|, it will drop downwardly onto the ledge 2! and in dropping down the coal will come into contact with the streams of steam which will thereupon force the coal forwardly and into the interior of the fire box. The jet openings Z3 are disposed in forwardly divergent relation, as shown in Figure 1, so that the coal will be spread out over the interior of the fire box. As the outer portions of the coal stream pass over the nozzle members 24, the jets carried by the nozzle members 24 will force the coal to be discharged laterally of the main stream of coal in order that the rear portion of the fire box will be covered with coal and so that the entire 'surfaceof the grates in the fire box will be covered with coal.

As shown in Figure 4 at least two of the jets 23 are arranged as low pressure or bell jets, being designated 23 and positioned rearwardly of the lateral nozzles 24 so that the coal will be delivered to nozzles in a manner such that the coal may be turned in its movement and delivered laterally into the firebox. The larger delivery openings of the jets 23 provide for a reduction in the steam pressure at the point of delivery and the consequent slower movement of the coal which is delivered to the nozzles 24:.

What I claim is:

1. In a stoker, a coal distributing means for mounting in the feeding opening of a firebox, said means comprising a coal guiding plate formed with a horizontally disposed steam passage parallel with the forward edge of said plate and having a plurality of main jet openings in the forward edge communicating with said passage, a pair of oppositely disposed nozzles projecting forwardly from said plate and disposed forwardly of said main jet openings, said nozzles being disposed below said main jet openings and laterally of'the outermost of said main jet openings, said nozzles being-formed with a pair of jet openings arranged so as to project a substantial portion of the fuel at substantially right angles to the movement of fuel effected by the fluid discharged from said main jet openings whereby fuel will be discharged into the firebox adjacent the front wall thereof, a coal guiding member depending from the forward end of said plate and engaging the adjacent wall of the firebox, a pair of rearwardly extending arms carried by said guiding member, said plate having a pair of sockets in which said arms removably engage, a pair of locking members for locking said arms in said sockets, said guiding member being formed with recesses within which said nozzles engage whereby the upper surfaces of said nozzles will be substantially flush with the upper surface of said guiding member. I

2. In a stoker, a coal distributing means for mounting in the feeding opening of a firebox, said means comprising a coal guiding plate formed with a horizontally disposed steam passage parallel with the forward edge of said plate and having a plurality of main jet openings in the forward edge communicating with said passage, a pair of oppositely disposed nozzles projecting forwardly from said plate and disposed forwardly of said main jet openings, said nozzles being disposed below said main jet openings and laterally of the outermost of said main jet openings, said nozzles being formed with a jair of jet openings arranged so'as to project a substantial portion of the fuel atsubstantially right angles to the movement of fuel effected by the fluid discharged from said main jet openingwhereby fuel will be discharged into the firebox adjacent the front wall thereof, a coal guiding member depending from the forward end of said plate and engaging the adjacent wall of the firebox, a rearward extension carried by said guiding member, and means forming part of said plate for engagement with said extension and whereby said, guiding member and said plate are detachably held together with each other, said guiding member being formed to receive said nozzles.

SHEPPARD BOYD YATES. 

